System for providing write notification during data set copy

Details System for providing write notification during data set copy System for providing write notification during data set copy

1997-04-18

1999-06-22

Cabeca, John W.

Electrical computers and digital processing systems: memory

Storage accessing and control

Access timing

711162, G06F 928

Patent

active

059152648

ABSTRACT:
The write notification during copy system functions to enable the data processor to manage the data file copy function of a disk data storage subsystem in a manner that minimizes the expenditure of data processor resources. This is accomplished by the write notification during copy system determining the source volume on the data storage subsystem, the target volume on the data storage subsystem and identifying the extents of both. The write notification during copy system then transmits data to the data storage subsystem, representative of the assignment of DASD full tracks from the source location on the data storage subsystem as well as DASD full tracks from the target location on the data storage subsystem. The data processor based write notification during copy system then uses ECAM channel programs to instruct the data storage subsystem to perform the data file copy operation using snapshot track pointer copy operations. Upon conclusion of the data file copy operation by the data storage subsystem, the write notification during copy system updates the meta data required to complete the data file copy operation and indicates whether the copy completed with/without any conflicting write operation against the source or target.

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